1/*
2 * Copyright (c) 1987, 1993
3 *    The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
32 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
33 *
34 * Permission to use, copy, modify, and distribute this software for any
35 * purpose with or without fee is hereby granted, provided that the above
36 * copyright notice and this permission notice appear in all copies.
37 *
38 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
39 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
41 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
42 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
43 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
44 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
45 */
46
47#if defined(LIBC_SCCS) && !defined(lint)
48static const char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
49static const char rcsid[] = "$Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $";
50#endif /* LIBC_SCCS and not lint */
51#include <sys/cdefs.h>
52__FBSDID("$FreeBSD$");
53
54#include "port_before.h"
55
56#include "namespace.h"
57#include <sys/param.h>
58#include <sys/uio.h>
59
60#include <netinet/in.h>
61#include <arpa/nameser.h>
62
63#include <netdb.h>
64#include <resolv.h>
65#include <string.h>
66#include <unistd.h>
67#include "un-namespace.h"
68
69#include "port_after.h"
70
71const char *h_errlist[] = {
72	"Resolver Error 0 (no error)",
73	"Unknown host",				/*%< 1 HOST_NOT_FOUND */
74	"Host name lookup failure",		/*%< 2 TRY_AGAIN */
75	"Unknown server error",			/*%< 3 NO_RECOVERY */
76	"No address associated with name",	/*%< 4 NO_ADDRESS */
77};
78const int h_nerr = { nitems(h_errlist) };
79
80#undef	h_errno
81int	h_errno;
82
83/*%
84 * herror --
85 *	print the error indicated by the h_errno value.
86 */
87void
88herror(const char *s) {
89	struct iovec iov[4], *v = iov;
90	char *t;
91
92	if (s != NULL && *s != '\0') {
93		DE_CONST(s, t);
94		v->iov_base = t;
95		v->iov_len = strlen(t);
96		v++;
97		DE_CONST(": ", t);
98		v->iov_base = t;
99		v->iov_len = 2;
100		v++;
101	}
102	DE_CONST(hstrerror(*__h_errno()), t);
103	v->iov_base = t;
104	v->iov_len = strlen(v->iov_base);
105	v++;
106	DE_CONST("\n", t);
107	v->iov_base = t;
108	v->iov_len = 1;
109	_writev(STDERR_FILENO, iov, (v - iov) + 1);
110}
111
112/*%
113 * hstrerror --
114 *	return the string associated with a given "host" errno value.
115 */
116const char *
117hstrerror(int err) {
118	if (err < 0)
119		return ("Resolver internal error");
120	else if (err < h_nerr)
121		return (h_errlist[err]);
122	return ("Unknown resolver error");
123}
124
125/*! \file */
126